Neco 2025 Chemistry Question 34

Practice objective / multiple choice question 34 from the 2025 Neco Chemistry examination.

Neco 2025 Chemistry Objective / Multiple Choice Medium Difficulty
Question 34 NECO • 2025 • CHEMISTRY • objective

At 25 °C a saturated solution of calcium fluoride contains a fluoride ion concentration of 0.0100 M. (a) Calculate the solubility product \(K_{sp}\) of CaF_2. (b) If solid NaF is added so that the fluoride concentration becomes 0.0500 M and the solution remains saturated with respect to CaF_2, determine the new calcium ion concentration and the solubility of CaF_2 (in mol L^{-1}).

Answer Options

A. (a) 1.0×10⁻⁶ (b) [Ca^{2+}] = 2.0×10⁻³ M; solubility = 2.0×10⁻³ mol L⁻¹
B. (a) 5.0×10⁻⁶ (b) [Ca^{2+}] = 5.0×10⁻⁴ M; solubility = 5.0×10⁻⁴ mol L⁻¹
Correct Answer C. (a) 5.0×10⁻⁷ (b) [Ca^{2+}] = 2.0×10⁻⁴ M; solubility = 2.0×10⁻⁴ mol L⁻¹
D. (a) 2.5×10⁻⁶ (b) [Ca^{2+}] = 1.0×10⁻⁴ M; solubility = 1.0×10⁻⁴ mol L⁻¹
Correct Answer
C
Correct Option:
(a) 5.0×10⁻⁷ (b) [Ca^{2+}] = 2.0×10⁻⁴ M; solubility = 2.0×10⁻⁴ mol L⁻¹

About This Question

This is Neco 2025 Chemistry Question 34. It is one of the objective questions from the 2025 Neco Chemistry examination.

Difficulty level: Medium .

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